Interesting question, I hadn't really thought about it much.
My favorite genre is romance, and there I don't have to chose, I always get 2 main characters and in most cases they are one male and one female. Unless I read mm. So I get both.
Now I also love historical mysteries and urban fantasy and mysteries. So far most of the mysteries I read also have 2 leads, but it tends to lean more towards one or the other. historical mysteries seems to be split between the male lead and the female lead, depending on the series.
Urban fantasy on the other hand the lead is mostly female in the ones I read.
I read by genre mostly, I know what I like. After that I want a good story.
I do have to say that the term "kick ass female" is a turnoff for me. I just don't like that term. So at the time I am sticking with the urban fantasy series I have started as some new ones use that term. I want fully rounded characters and its weird to use that term as the only descriptor. After I read something I might say this is a strong female character, if I have to point it out at all.